Apparatus for producing protected metal sheets having perforated fibrous layers



J. HAMILL.

APPARATUS FOR PRODUCING PROTECTED METAL SHEETS HAVING PERFORATED FIBROUSLAYERS.

APPLICATION FILED MAY 9, 19H.

Patented July 27, 1920.

l7zveizd'0 7' W W 24 6 wow a sheet shown in saturation of the sheet withthe relatively strength,-

UNITED" STATES PATENT OFFICE.

JAMES HAMILL, 0E LAMBEETVILLEQNEW JEEsEY, ASSIGNOR To AsBEsTos PROTECTEDMETAL COMPANY, 0E PITTSBURGH, PENNSYLVANIA, A con,-

PORATION OF PENNSYLVANIA.

APPARATUS FOR PRODUCING PROTECTED METAL SHEETS HAVING PER'FORATEDFIBROUS LAYERS.

Specification of Letters Patent.

Application filed Kay 9, 1917. Serial No. 167,512.

To all whom it may concern:

Be it known that I,'JAMES HAMILL, a citizen of the United States, and aresident of Fibrous Layers, of which the following de-" scription, inconnection with the accompanying drawings, is a specification, likecharacters on the drawings representing like parts.

This invention relates to an apparatus for producing a novel productcomposed in whole or in part of fibrous material saturated orimpregnated with a saturating material.

The apparatus is especially applicable for treating sheets, webs orlayers of fibrous materials, such as asbestos felt or paper, wool felt,paper stock in sheet form, artificial leather, fiber board and the like,which under normal conditions resist penetration by a relatively thickor heavy .saturant, whereby a superior impregnation or saturation may beobtained with a thicker or heavier saturant at a relatively lowtemperature, at which danger of injuring the fibrous material by highheat is avoided and a stronger and better article produced.

The invention is particularly applicable among other uses for thetreatment of fibrous sheets or layers, such as asbestos are to be imregnated or saturated with bituminous su stances, such as asphalt, orwith other adhesive material, and to facilitate description, I willhereinafter refer to the fibrous material as asbestos paper andthesaturant as as halt.

The particular eatnres of this invention will be pointed out in theclaims at the end of this specification.

Figure 1 represents in section and elevation one form of apparatusembodying the invention.

Figs. 2 and 3, details of the perforating device shown in Fig. 1.

Fig. 4:, a section of the paper sheet or layer applied to one surface ofthe metal Fig. 1, to illustrate the thick asphalt.

-- passes between the delivery r As stated above, the perforatingdevices.-

Fig. 5, a like section with the perforationsextccnded but partiallythrough the sheet, an

Fig. 6, a section like Fig. 4 showing the surfaces covered with asphalt.

In Fig. 1, I have represented one form of apparatus embodying theinvention, which apparatus is in the main substantially such as shown inU. S. Patent N0. 1,002,303, dated September 5, 1911, and is employedfor-producmg asbestos protected metal sheets, and consists of a kettle10 containing a bath of asphalt 12, maintained in a fluid condition byheat supplied by burners 13 .or otherwise, and through which bath ametal sheet 14 is passed so as to be covered with the asphalt, whichserves to cement to the opposite surfaces of said metal sheet, webs,layers or sheets 15, 16, of asbestos paper, which are taken from rolls17, 18, of the same.

The metal sheet 14 is fed through the bath by suitable feed rolls,represented ,by the gears 19, 20, and is properly directed by suitableguides 21 to delivery rolls, about which the asbestos webs15, 16, arepassed, ggdgswhich are represented by the gears In order to obtainasuperior saturation or impregnation of the paper webs or sheets 15, 16,with the asphalt 12, the said paper webs or sheets are provided withsubstantially small or fine perforations 25, which may extend entirelythrough the paper as represented on an enlarged scale in Figs.'4 and 6,or but partiall therethrough as'represented in Fig. 5. hese perforationsmay be made in the paper webs by suitable devices, herein represented asprick points or projections 26 on the circumference of rollers 27, 28,which points or projections may be made in any siutable manner, and saidrollers are located between the rolls 17 18, and the delivery rollers22, 23, and cooperate with bed rolls 30, 31, which support the paperwebs 15, 16, to perforate the latter before they are brought intocontact with the asphalt coated metal sheetilas the latter re s.

are made sufliciently thin or small so as to permit of the paper websbeing perforated without injuring the paper or weakening its PatentedJuly 27,1920.

When the perforated paper webs are brought into contact with the asphaltcoated metal sheet 14, the paper webs are adhesively attached to themetal sheet by the asphalt ,which covers the surfaces of the metalsheet, and the asphalt on the metal sheet is more'or less absorbed bythe paper webs, and a portion of the asphalt fills the perforations,which act as reservoirs or wells to feed the asphalt into the interioror body portion 'of the aper web or sheet, as represented by the nelines 32 extended from said perforations, Fig.' 6. The perforationsremain filled with the asphalt, which when cooled form as halt-keys,rivets or bonds 33 for firmly bon ing together the laminae of the paperweb and also for e fiz'ec-. tively attaching the paper web to the metalsheet by a substantially large number of minute or small bonds.

As a result,the paper web is attached to the metal sheet in a superiormanner and a superior protected metal article is obtained.

The webs or sheets 15, 16, may be plain or non-saturated material, ormay be webs or sheets which have been previously perforated andsaturated before they are used with the apparatus shown in Fig. 1".

By means of the present invention, any given felt or layer of fibrousmaterial can be saturated with any given saturant at a much less heatthan is now possible, which, besides being economical, increases therange of saturating materials with respect to those fibers which areinjured by a higher heat.

So also a very much heavler saturant may be used for any given material,which results in a stiffer, stronger and better product. Furthermore thetime required for saturation is shortened to a marked degree; with acoresponding increase in the commercial production.

I have herein represented one construction of device or appartus forperforating 1 the fibrous felt, paper or like material and for applyingit to the metal sheet, but it is not desired to limit the invention tothe parheavy saturant, a bed roll to support a paper web or sheet, aperforating roll cooperating with the bed roll to perforate the paperweb or sheet While the latter is supported by said bed roll, and meansfor applying said perforated paper web to the coated surface of saidmetal sheet.

2. Apparatus of the character described, comprising means for coatingthe opposite surfaces of a metal sheet with a liquid adhesive, means forapplying sheets of material composed in Whole or in part'of fibrousmaterial to the opposite surfaces of said metal sheet, and perforatingdevices cooperating with said fibrous sheets to provide them withsubstantially small perforations before they are engaged with the coatedmetal sheet. n

3. Apparatus of the character described, comprising means for coatingthe opposite surfaces of a metal sheet with a liquid adhesive, means forapplying sheets of material composed in whole or in part of fibrousmaterial to the opposite surfaces of said metal sheet, perforating rollscooperating with said fibrous sheets to provide them with substantiallysmall perforations before they are engaged with the coated metal sheet,and bed rolls to support the said fibrous sheets while they are beingperforated;

In testimony whereof I have signed my name to this specification.

I JAMES 'HAMILL.

